package io.renren.common.utils;
import java.security.MessageDigest;

/**
 * <p>Title: SHA1算法</p>
 *
 * @author levi
 */
public final class SHA1 {

    private static final char[] HEX_DIGITS = {'0', '1', '2', '3', '4', '5',
            '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};

    /**
     * Takes the raw bytes from the digest and formats them correct.
     *
     * @param bytes the raw bytes from the digest.
     * @return the formatted bytes.
     */
    private static String getFormattedText(byte[] bytes) {
        int len = bytes.length;
        StringBuilder buf = new StringBuilder(len * 2);
        // 把密文转换成十六进制的字符串形式
        for (int j = 0; j < len; j++) {
            buf.append(HEX_DIGITS[(bytes[j] >> 4) & 0x0f]);
            buf.append(HEX_DIGITS[bytes[j] & 0x0f]);
        }
        return buf.toString();
    }

    public static String encode(String str) {
        if (str == null) {
            return null;
        }
        try {
            MessageDigest messageDigest = MessageDigest.getInstance("SHA1");
            messageDigest.update(str.getBytes());
            return getFormattedText(messageDigest.digest());
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    public static void main(String[] args) {
        String str = "jsapi_ticket=sM4AOVdWfPE4DxkXGEs8VDHhU4VhdQHnvA67cJl8LOgiO1WU9Cpvz3zImim9se-MTPdgiwrAKad5IqhkxDPi4w&noncestr=ca5f84b266e42a6ed81cc32e686eb49fa95b4e8b&timestamp=1543935181&url=https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=16_c2hwznDuvN9KpDvUiXPm0hPlpnCqvRRISwTTk2As87edJdDlcu13oNxCV02baV_6FnFwjbLS8veEgVgi3h7Bxj8ePRbkCBTjVaRFO7MFWYC75eYGs6F-07Cdq0vJ2EoT6N9zpaSLyflqyfRLMMHgACADDY&type=jsapi";
        System.out.println(encode(str));
    }
}